/*
 * Created on 22 Jun 2006
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package controller.networkmanager.udp;

import java.nio.ByteBuffer;

import controller.config.COConfigurationManager;
import torrentlib.util.logging.LogIDs;

import controller.networkmanager.TransportEndpoint;
import controller.networkmanager.TransportStartpoint;
import controller.networkmanager.TransportHelperFilter;
import controller.networkmanager.Transport;

public class 
UDPTransport
	extends Transport
{
	private static final LogIDs LOGID = LogIDs.NET;
	
	private ProtocolEndpointUDP		endpoint;
	private byte[][]				shared_secrets;
	
	private int transport_mode = TRANSPORT_MODE_NORMAL;
	
	private volatile boolean	closed;
	
	protected
	UDPTransport(
		ProtocolEndpointUDP		_endpoint,
		byte[][]				_shared_secrets )
	{
		endpoint		= _endpoint;
		shared_secrets	= _shared_secrets;
	}

	protected
	UDPTransport(
		ProtocolEndpointUDP		_endpoint,
		TransportHelperFilter	_filter )
	{
		endpoint		= _endpoint;
	
		setFilter( _filter );
	}
	
	public boolean 
	isTCP()
	{ 
		return( false );
	}
	
	public boolean 
	isSOCKS() 
	{
		return( false );
	}
	
	public String 
	getProtocol()
	{
		return "UDP"; 
	}
	
	public TransportEndpoint 
	getTransportEndpoint()
	{
		return( new TransportEndpointUDP( endpoint ));
	}
	  
	public TransportStartpoint 
	getTransportStartpoint() 
	{
		return( null );
	}
	
	public int
	getMssSize()
	{
	  return( UDPNetworkManager.getUdpMssSize());
	}
	 
	public String 
	getDescription()
	{
		return( endpoint.getAddress().toString());
	}
	
	public void 
	setTransportMode( 
		int mode )
	{
		transport_mode	= mode;
	}
	 
	public int 
	getTransportMode()
	{
		return( transport_mode );
	}
	
	public void
	connectOutbound(
		ByteBuffer				initial_data,
		final ConnectListener 	listener,
		int						priority )
	{
		if ( !UDPNetworkManager.UDP_OUTGOING_ENABLED ){
			
			listener.connectFailure( new Throwable( "Outbound UDP connections disabled" ));
			
			return;
		}
		
		if ( closed ){
			
			listener.connectFailure( new Throwable( "Connection already closed" ));
			
			return;
		}
		    
		if( getFilter() != null ){
		     
			listener.connectFailure( new Throwable( "Already connected" ));
			
			return;
		}
		
		if ( COConfigurationManager.getBooleanParameter( "Proxy.Data.Enable" )){
			
			listener.connectFailure( new Throwable( "UDP proxy connection not supported" ));
			
			return;
		}
		   
		UDPConnectionManager	con_man = UDPNetworkManager.getSingleton().getConnectionManager();
		
		con_man.connectOutbound( this, endpoint.getAddress(), shared_secrets, initial_data, listener);
	}
	  
	public void 
	close(
		String	reason )
	{
		closed	= true;
		
		readyForRead( false );
		readyForWrite( false );

		TransportHelperFilter	filter = getFilter();
		
		if ( filter != null ){
			
			filter.getHelper().close( reason );
			
			setFilter( null );
		}
	}
	
	public boolean
	isClosed()
	{
		return( closed );
	}
}
